<template>
    <ul class="keyboard">
        <li v-for="(key,index) in keyList" :key="index" track-by="$index" :class="{delete: key === 'Delete', tab: key === 'Tab', capslock: key === 'Caps', enter: key === 'Enter', shift: key === 'Shift', space: key === 'Space', shifted: (key === 'Shift') && hasShifted, capsed: (key === 'Caps') && hasCapsed }" v-text="key" @click="clickKey(key)"></li>
    </ul>
</template>
<script>
    export default {
        data() {
            return {
                keyList: [],
                normalKeyList: [],
                shiftedKeyList: [],
                capsedKeyList: [],
                hasShifted: false,
                hasCapsed: false,
                keyvalue:"",
            }
        },
        created(){
            this.ready();
        },
        methods: {
            clickKey(key) {
                switch(key) {
                    case "Delete":
                        let kbt = this.keyvalue;
                        this.keyvalue = kbt.length ? kbt.substring(0, kbt.length - 1) : kbt;
                        break;

                    case "Tab":
                        this.keyvalue += "\t";
                        break;

                    case "Enter":
                        this.keyvalue += "\n";
                        break;

                    case "Space":
                        this.keyvalue += " ";
                        break;

                    case "Caps":
                        this.hasCapsed = !this.hasCapsed;
                        this.keyList = this.hasCapsed ? this.capsedKeyList : this.normalKeyList;
                        break;

                    case "Shift":
                        this.hasShifted = !this.hasShifted;
                        this.keyList = this.hasShifted ? this.shiftedKeyList : this.normalKeyList;
                        break;

                    default:
                        this.keyvalue += key;
                        break;
                }
                console.log(this.keyvalue)
                this.$emit("updatekey",this.keyvalue)
            },
            ready() {
                let normalKeyList = ['`', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', 'Delete',
                        'Tab', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\\',
                        'Caps', 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', "'", 'Enter',
                        'Shift', 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/', 'Shift',
                        'Space'],

                    shiftedKeyList = ['~', '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+', 'Delete',
                        'Tab', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', '|',
                        'Caps', 'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', 'Enter',
                        'Shift', 'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?', 'Shift',
                        'Space'],

                    capsedKeyList = ['`', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', 'Delete',
                        'Tab', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '[', ']', '\\',
                        'Caps', 'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ';', "'", 'Enter',
                        'Shift', 'Z', 'X', 'C', 'V', 'B', 'N', 'M', ',', '.', '/', 'Shift',
                        'Space'];

                this.keyList = this.normalKeyList = normalKeyList;
                this.shiftedKeyList = shiftedKeyList;
                this.capsedKeyList = capsedKeyList;
            }
        },

    }
</script>

<style scoped>
    .keyboard {
        width: 665px;
        margin: 0;
        padding: 0;
        list-style: none;
        user-select: none;

        li {
            float: left;
            margin: 0 5px 5px 0;
            width: 40px;
            height: 40px;
            line-height: 40px;
            text-align: center;
            background: #fff;
            border: 1px solid #e5e5e5;
            border-radius: 5px;

            &:hover {
                position: relative;
                border-color: gray;
                cursor: pointer;
            }
            &:active {
                top: 1px;
                left: 1px;
            }
        }

        .tab, .delete {
            width: 70px;
        }
        .capslock {
            width: 80px;
        }
        .enter {
            width: 77px;
        }
        .shift {
            width: 102px;
        }
        .space {
            clear: left;
            width: 660px;
        }
        .shifted {
            position: relative;
            top: 1px;
            left: 1px;
            border-color: #e5e5e5;
            cursor: pointer;
        }
        .capsed {
            position: relative;
            top: 1px;
            left: 1px;
            border-color: #e5e5e5;
            cursor: pointer;
        }
    }
</style>